| G | Glycine (amino acid) |
| G | Guanine(nucleic acid component) |
| G | When followed by a number, a chromatographic phase |
| G | Gewehr (firearm; usually a rifle) |
| G-6-PDH | Glucose-6-Phosphate Dehydrogenase |
| G6PD | Glucose-6-Phosphate Dehydrogenase |
| GA | US designation for Tabun; Ethyl diethylamidocyanophosphate |
| GAA | Gewerbeaufsichtsamt |
| GAAP | Generally accepted accounting principles |
| GAAP | Generally accepted accounting practices |
| GABA | Gamma-aminobutyric acid |
| Gal-1-PUT | Galactose-1-Phosphate Uridyl Transferase |
| GALCIT | Guggenheim Aeronautical Laboratory, California Inst. of Technology |
| GALP | Good automated laboratory procedure |
| GAMA | Gas Appliance Manufacturers Association |
| GAO | General Accounting Office (US) |
| GAP | Glycidyl Azide polymer |
| GB | US designation for Sarin; O,O-di-isopropyl methanefluorophosphonate |
| GB | Gall Bladder |
| GC | GonoCoccus (Neisseria gonorrheae) |
| GC-MS | Gas Chromatography - Mass Spectrometry |
| GC | Gas Chromatograhy |
| GCA | Gun Control Act (of 1968) (US) |
| GCP | Good Clinical Practice |
| GCR | Gray Component Replacement (color printing technique) |
| GCR | Group Code Recording (magnetic tape, some disks) |
| GD | Chem. warfare symbol for Soman |
| GDF | Geographic data format |
| GDP | Gross Domestic Product |
| GDP | Good Distribution Practice (UK, pharmaceuticals) |
| GE | General Electric Co. |
| GEMS | Global Environmental Monitoring System |
| GenTG | Gentechnikgesetz /Biotechnology Act |
| GenTSV | Gentechnikverfahrensordnung/Biotech. Procedures Regulation |
| GEOLIS | Geographisches Landinformationssystem (IBM) |
| GEWIS | Gewässerinformationssystem |
| GF | Gel filtration |
| GFAAS | Graphite Furnace Atomic Absorption Spectrometry |
| GFCI | Ground Fault Circuit Interrupter |
| GFP | Green fluorescent protein |
| GG | Grundgesetz/ Constitution |
| GGT | Gamma-glutamyl transferase |
| GGTP | Gamma-Glutamyl TransPeptidase |
| GGV | Gefährgutverordnung |
| GH | Growth Hormone |
| GHSV | Gas hourly space velocity |
| GI | GastroIntestinal |
| GI | U. S. soldier (especially World War II) |
| GI | Gesellschaft für Informatik |
| GI | Government Issue |
| GIAP | Graphisch interaktiver Arbeitsplatz |
| GIAT | Groupement Industriel des Armaments Terrestres |
| GIDEP | Government-Industry Data Exchange Program |
| GIE | Groupement d'Interet Economique |
| GIGO | Garbage In, Garbage Out |
| GLA | Gamma carboxyglutamic Acid |
| GLA | Geologisches Landesamt |
| GLC | Gas-Liquid Chromatography |
| Gln | Glutamine |
| GLP | Good Laboratory Practice (may have limited application) |
| Gly | Glycine |
| GMA | Grocery Manufacturers of America |
| GMIS | Gas Manufacturers Intermediate Standard |
| GMO | Genetically modified organism(s)s |
| GMP | Good Manufacturing Practice (pharmaceuticals) |
| GMT | Greenwich mean time (now UTC) |
| GnA | Gnadenheft |
| GNG | Gesundheitsneuordnungsgesetz / Act on Reorg. of Central Health Inst's. |
| GO | Gebührenordnung |
| GOAe | Gebührenordnung für Artzte |
| GOCO | Government-Owned Contractor-Operated |
| GOT | Glutamate-Oxalate Transaminase |
| GOX | Glyphosate oxidoreductase |
| GP | General practitioner |
| GPA | Grade Point Average |
| GPCR | G-protein-couple receptors |
| GPIa | Generic Pharmaceutical Industry Association |
| GPIB | General purpose interface bus |
| GPL | General population limit |
| GPL | Graphic Programming Language |
| GPO | Government Printing Office (USA) |
| GPT | Glutamate-Pyruvate Transaminase |
| GPx | Glucathione periodidase |
| GQM | Gain quotidien moyen(see ADG) |
| GRAS | Generally Recognized As Safe |
| GRASS | Geographical Resources Analysis Support System |
| GRID | Global Resource Information Database |
| GSA | Gefahrstoffschnellauskunft |
| GSC | Gas-Solid Chromatography |
| GSH | Glutathione (reduced) |
| GSL | General Sale List medicine (UK) |
| GSM | Groupe Special Mobile |
| GSR | Gun-Shot Residue |
| GSR | Galvanic Skin Resistance |
| GSSG | Glutathione (oxidized) |
| GST | Glutathione S-transferase |
| GTAW | Gas tungsten arc welding |
| GTE | General Telephone and Electronics (but usually GTE) |
| GTG | Giemsa banding technique |
| GTT | Glucose Tolerance Test |
| GTU | Gesellschaft für Technologie- und Umweltschutzberatung |
| GTZ | Gesellschaft für technische Zusammenarbeit |
| GUI | Graphic(al) Users Interface(computer) |
| GÜN | Gewässerüberwachungssystem Niedersachsen |
| GÜS | Gewässerguteüberwachungssystem (NRW) |
| GUS | Glucuronidase (designation of gene) |
| GVD | Group Velocity Dispersion |
| GVP | Gesundheits Verträglichkeitsprüfung |
| GVW | Gross Vehicle Weight |
| GXP | GMP, GLP, and GCP |
| GYN | Gynecology, gynecologic |
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